We're fans of Sworkit because it's one of the simplest exercise apps out there. All you have to do is select how much time you have, and Sworkit automatically generates a circuit training workout for you. The update makes that process even better by giving you a breakdown of your daily totals, showing you an approximation of how many calories you've burned, and offering videos in case you don't know how to perform a particular exercise. If we had one complaint with the previous version, it was that it wasn't the best looking app in the world, but this update also completely overhauls the design with bigger icons and a smoother layout.